There are several products in the market to create a home LAN using the existing electrical wiring at home. In all of them the point of entry(or the emitter) is a device that is connected to a wall plug. What I'm trying to find is an emitter that can be mounted on the main electrical board, next to the circuit breakers.
I found it!
Just search for
Something like this but not sure if it exactly waht you want.
The only way is going to be to hack them and do waht you want. I have not seen anything like this for DIN.. even though i thought of it so many times.. because it makes sense. It will have to be something like this.
Essentially you will need to put one of these(below) in that (above)..